Electric vacuum cleaner



Feb. 11,- 1936. o. GRAVE 2,030,366

ELECTRIC VACUUM CLEANER Filed Oct. 26, 1954 2 Sheets-Sheet 1 "FIE;

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INVENTOR.

OTTO G RAV E.

BY. W Baumm 11, 1936- o. GRAVE ,030,366

ELECTRIC VACUUM CLEANER Filed Oct. 26, 19:54 2 Shootsbeei 2 L t, H53

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'NVENTUB Otto Grave.

Patented Feb. 11, 1936 I UNITED STATES PATENT .oFl-"ice ncome/vacuum m l m OMGI'BWBQIIIILGML. 7

Application October 26; 19st. set-mm. 750.140 In Germany November I, 1933 3Claims. (crass-2:2)

'Ihe invention relates to an electrical vacuum cleaner fn'which both the noises of the motor and of' the current of air are almost entirely suppressed.

I It has already become known, to mount the motor-fan apparatus, with a view to damping the noise in the vacuum cleaner housing with the interposition or elastic supports, io'r example rubber rings. Such an arrangement is however not i. sumcient to lessen the noise to any considerable extent, also it has heretofore been proposed to provide air damping es for reducing noise.

In accordance with the present invention the motor-fan is supported in and mounted on the II vacuum cleaner housing by means of two superimposed rubber rings or gaskets held in position by a ring of S-shaped cross section in order to reduce the noises due to the rotation of the motor, the housing containing the motor being I surrounded by an air chamber or jacket into which the air enters through slots provided for the purpose therein, said chamber being provided with a lining of canvas or other suitable material to lessen the noise caused by the curll rent of air.

Sheet metal members may be provided for deflecting the air while to further reduce the noises from the current of air, one of the suction fans may run in a separate chamber or compart- 80 mt closed by a cover having an inwardly directed inlet orifice.

In the drawings one form of construction of the object of the invention is shown by way of example. ll Pig. 1 shows a vertical longitudinal section through the vacuum cleaner.

Pig. 2 shows an enlarged section through the air chamber which indicates the path of the air.

Pig. 3 is a fragmentary section illustrating a modification in the construction of the air chamber lit. 4 is a similar view illustrating a further motor chamber is closed on all sides and has only a number of slits 82. Instead of'slits there canbe ll providedsieves ti'permeabietoair. From the motor. chamber the air passes through the openings 82 into an air chamber 33 (cf. Fla. 2) which surrounds the motor housings in the form of a jacket and is provided with plates II or the like to deflect the air. The outer wall of the air 5 chamber 33 is indicated by the reference numeral 35. It can for example be covered with linen or other material permeable to air, through which the air reaches the ring space -38 which lies between the wall 35 and the vacuum cleaner wall 31. From this ring space the air passes into the larger outlet chamber 38 and from there into the open.

The plates 34 have the task of deflecting the air. Owing to the linenjjacket 35 there is in 16 addition efiected 'a damping of the air, so that the air chamber acts as an air cushion. On issuing from the chamber the air expands as the ring space 36 is larger than the chamber 33. Owing to the deflection of the air, the damping and the 20 expansion on emerging from the smaller space into the larger one a complete elimination of the air noises is 'efl'ected.

In Fig. 2 is shown the path that the air takes. As the arrows show, the air entering the fan housing passes into the motor housing ii and from there through the slits 32 into the air chamber 33. Here the air is then projected against the plate 34, deflected and then led through the linen jacket 35 into the ring space it inside the casing 31. From there the air, after being deflected again, passes into the outlet chamber.

Instead of the linen covering the air chamber I 33 can have a solid wall of metal or the like, which is fitted with a number of slits, openings or the 35 like through which the air passes into the ring space 38. The slits or openings can be of any shape and in any position.

For the purpose of diminishing the motor noises the motor-fan is mounted with the aid of a ring 40 III of S-shaped section of elastic material between two elastic rings 39 and ti. Owing to this double rubber bearing all noises made by the motor are damped to such an extent that they cannot be transmitted to the outer walls of the vacuum cleaner. Instead of the S-shaped ring other means can be employed. It is essential that the housing of the motor-fan apparatus should be surrounded by a rubber ring which is supported against a body and that this body itself is supported against the walls of the vacuum cleaner by means of a second rubber ring. At the front the motor housing is held in its position by a bufler 42 of elastic material which is fastened to resilient arms ll. The motor housing can also be to qua-i:

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supported against the cap, in which case butters or other damping means are provided.

I claiman S-shaped ring holding said rubber rings in place, said rubber rings minimizing the motor noise, an air jacket surrounding said housing.

orifices in the housing for the admission of air propelled by the fans to said Jacket and a lining oi fabric to said air Jacket for l the noise oi entering air. I

, 2. In an electric vacuumcleaner,a casing, a housing, a motor located within said housing. two

rubber rings supporting saidmotor from the casing, ians driven by the motor producing a vacuum, an S-shaped ring holding said rubber rings in place, said rubber rings minimizing the noise or themotor. an air Jacket surrounding said housing, orifices in the housing for the admission or air propelled by the fans to said jacket, sheet metal members located in said jacket deflecting the air, and a lining of fabric to said jacket lessening the noise of the air current.

8. In an electric vacuum cleaner, a casing, a housing,-a motor located in said housing, two rubber rings supporting said motor from the casing, fans'driven by the motorproducing a vacuum, an' intermediate chamber enclosing one of said fans, a cover to said chamber provided with an inlet orifice, an S-shaped ring holding said rubber rings in place, said rubber rings minimizing the noise oi the motor, an air jacket surrounding said a housing, slits in the housing for the admission of air propelled by the fans to said jacket, sheet metal members located in said jacket deflecting the entering air and a lining oi fabric to said Jacket lessening the noise oi the air current.

o'rro GRAVE. 

